A5102935342- biodegradable polymer synthesis and properties
- Carbon dioxide utilization in catalysis
- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Magnetic properties of thin films
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- High-pressure geophysics and materials
- Electrochemical Analysis and Applications
- Nanoparticles: synthesis and applications
- Crystallography and Radiation Phenomena
- Microplastics and Plastic Pollution
- Organometallic Complex Synthesis and Catalysis
- Mesoporous Materials and Catalysis
- Molecular Junctions and Nanostructures
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced X-ray Imaging Techniques
- Quantum Dots Synthesis And Properties
- Silicone and Siloxane Chemistry
- Nuclear materials and radiation effects
- Graphene and Nanomaterials Applications
- Rheology and Fluid Dynamics Studies
- Characterization and Applications of Magnetic Nanoparticles
- Nuclear Physics and Applications
- Theoretical and Computational Physics
Universität Hamburg
2015-2024
Hamburg Institut (Germany)
2024
Institut Laue-Langevin
2023
Friedrich-Alexander-Universität Erlangen-Nürnberg
2020
Otto-von-Guericke University Magdeburg
2013-2015
ETH Zurich
2011-2012
National Cheng Kung University
2010
Fraunhofer Institute for Material and Beam Technology
2009
Technical University of Munich
1996-2006
NIST Center for Neutron Research
2003
Controlling anisotropy is a key concept to generate complex functionality in advanced materials. For this, oriented attachment of nanocrystal building blocks, self assembly particles into larger single crystalline objects, one the most promising approaches nanotechnology. We report here 2D PbS nanocrystals ultra-thin crystal sheets with dimensions on micrometer scale. found that this process initiated by co-solvents which alter nucleation and growth rates during primary formation finally...
We present an overview of the main techniques for production and processing graphene related materials (GRMs), as well key characterization procedures. adopt a 'hands-on' approach, providing practical details procedures derived from literature authors' experience, in order to enable reader reproduce results.
We describe the design and current performance of high-flux backscattering spectrometer located at NIST Center for Neutron Research. The incorporates several state-of-the-art neutron optical devices to achieve highest flux on sample possible while maintaining an energy resolution less than 1 μeV. Foremost among these is a novel phase-space transformation chopper that significantly reduces mismatch between beam divergences primary secondary parts instrument. This resolves long-standing...
Analytical expressions for the scattering functions of ordered mesoscopic materials are derived and compared to experimentally determined curves. Ordered structures comprising spheres (fcc, bcc, hcp, sc), cylinders (hex, sq), lamellar considered. The take into account particle size distributions lattice point deviations, domain size, core/shell structures, as well peak shapes varying analytically between Lorentzian Gaussian functions. allow one quantitatively describe high-resolution...
Nanosilver is most attractive for its bactericidal properties in modern textiles, food packaging, and biomedical applications. Concerns, however, about released Ag+ ions during dispersion of nanosilver liquids have limited broad use. Here, supported on nanostructured silica made with closely controlled Ag size both by dry (flame aerosol) wet chemistry (impregnation) processes without any surface functionalization that could interfere ion release. It characterized electron microscopy, atomic...
The rise of two-dimensional (2D) graphene-cognated crystals with nonzero band gaps like transition metal dichalcogenides has led to a rapidly increasing interest in their dimensionality-dependent anisotropic properties, which bear high potential for ultrathin electronics. 2D the III–VI chalcogenide InSe represent new kind material class predestined use optoelectronic applications as highly responsive photodetectors and field-effect transistors. We present solution-processable method...
Nanoporous membranes with tailored size pores and multifunctionality derived from self-assembled block copolymers attract growing interest in ultrafiltration. The influence of the structure copolymer membrane casting solution on formation integral asymmetric isoporous using nonsolvent induced phase separation process (NIPS) has been one long-standing questions this research area. In work we studied principal role solvent micellization self-assembly polystyrene-block-poly(4-vinylpyridine)...
Vitrimers based on block copolymers give access to adaptable polymer networks where the resulting properties can be adjusted not only by vitrimer chemistry itself but also influenced structure of copolymer. In this work, linear AB, ABA, and BAB are introduced as backbones in vinylogous urethane vitrimers produce crosslinked materials that reprocessable have a wide range tunable mechanical properties. The narrow-disperse were synthesized photoiniferter reversible addition-fragmentation chain...
We studied the effect of densification on vibrational dynamics a ${\mathrm{Na}}_{2}{\mathrm{FeSi}}_{3}{\mathrm{O}}_{8}$ glass. The density states (DOS) has been measured using nuclear inelastic scattering. corresponding changes in microscopic, intermediate-range, and macroscopic properties have also investigated. results reveal that, absence local structure transformations, Debye level glass-specific excess above it same dependence density, evolution DOS is fully described by transformation...
We use synchrotron radiation and time resolved x-ray detection to measure structural relaxations of glycerol [${\mathrm{C}}_{3}$${\mathrm{H}}_{5}$(OH${)}_{3}$] having scales 30 200 ns at $1.5{\AA{}}^{\ensuremath{-}1}$ momentum transfer. Foils containing ${}^{57}$Fe (14.4 keV nuclear resonance, 141 lifetime) are placed before after the nonresonant sample, a small difference $(\ensuremath{\sim}70\mathrm{MHz})$ is established in their response frequencies. Quasielastic scattering from sample...
n-channel organic semiconductors are prone to oxidation upon exposed ambient conditions. Herein, we report design and synthesis of diketopyrrolopyrrole (DPP)-based oligomers for ambipolar thin-film transistors (OFETs) with excellent air bias stability at The cyclic voltammetry measurements reveal exceptional electrochemical during the redox cycle oligomers. Structural properties including aggregation, crystallinity, morphology in thin film were investigated by UV–visible spectroscopy, atomic...
A poly( l -lactide) with a trifluoro ethyl ester end group and an average degree of polymerization (DP) 50 was synthesized by ROP -lactide initiated trifluoroethanol.
In this study the chemiresistive responses of gold nanoparticle superlattices are investigated by GISAXS and microgravimetry.
Hydrogen bonded supramolecular styrene–butadiene copolymers are investigated regarding their structure–property relationships using DSC, DMA, FTIR and SAXS.
The usefulness of seven different tin catalysts, bismuth subsalicylate and titan tetra(ethoxide) for the polycondensation ethyl l -lactate (ELA) was examined at 150 °C 6 d.
Inelastic scattering of x rays by gaseous, liquid, and solid samples was measured using a nuclear transition as reference for the energy analysis scattered radiation. The were irradiated beam synchrotron radiation with bandwidth 6.4 meV. analyzed resonance detector bandpass 0.5 \ensuremath{\mu}eV. These studies introduce new technique to measure distribution inelastic x-ray scattering.
The thin-film morphologies of double-ring-banded and ringless spherulites in melt-crystallized poly(ethylene adipate) (PEA) were examined using atomic-force microscopy (AFM) polarizing optical techniques with phase image depth profiles. For the PEA ring-banded (Tc = 30 °C), edge-on lamellae, top views shaped like a figure 8, are arranged an orderly fashion on ridges ring bands, valley region bands is filled mainly flat-on oval-shaped platelets. Between band regions, some ribbonlike long...
A new kind of high melting (H<italic>T</italic><sub>m</sub>) pol(<sc>l</sc>-lactide) was discovered when cyclic poly(<sc>l</sc>-lactide)s were prepared by ring-expansion polymerization with tin catalysts at 130–160 °C in bulk.
Nanomaterials with a defined composition and structure can be synthesized by exploiting natural templates or biomolecular matrices. In the present work, we use protein nanocages derived from human ferritin as nanoscale building block for assembly of gold nanoparticles fluorescent molecules in solid state. As generalizable strategy, show that prior to material synthesis, cargo encapsulated into using dis- reassembly approach. Toward this end, new ligand system enables efficient encapsulation...